Control system for an engine-driven AC generator

Details Control system for an engine-driven AC generator Control system for an engine-driven AC generator

1987-07-09

1988-12-06

Salce, Patrick R.

Electricity: single generator systems

Automatic control of generator or driving means

Voltage of generator or circuit supplied

322 59, 322 99, 320 64, 361 21, 361 93, 318139, H02P 900

Patent

active

047898178

ABSTRACT:
The present invention relates to a control system for an engine driven generator, and more specifically, to a control system for controlling the field current to the field coil of the generator to prevent a rapid decrease in the engine rotational speed throughout a transient period when an electric load, such as a head light or an air conditioner, is switched on and begins to draw current.
In one embodiment of the invention, the control system comprises digital control means for repeatedly alternating throughout the transient period between calculating an on period and switching the field current on for the on period, and then calculating an off period and switching the field current off for the off period. The digital control means also detects a high output torque operating condition of the engine, and when such a condition is present, switches the field current on throughout the entire transient period.
In a second embodiment of the invention, the control system comprises analog or "hard-wired" control means for performing the same functions as the digital control means.

REFERENCES:
patent: 3938005 (1976-02-01), Cummins
patent: 4200832 (1980-04-01), Johansson et al.
patent: 4401937 (1983-08-01), Morishita
patent: 4449080 (1984-05-01), Konrad et al.
patent: 4470003 (1984-09-01), Mitchell
patent: 4555742 (1985-11-01), Gray et al.

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